RE: [eec] Tach driver for '99+ COP EECs??

["BYSTERVELD, Peter D." <pbysterveld@xxxxxxxxxxxxx>]

Richard,
I think some tacho's (late model) are designed to take a square wave from
the ecu. So depending on the tacho you have there are a couple of solutions.
I'm assuming you have the more common tach triggered from the negative side
of the coil.
If you can find a square wave tach output you can connect this to the coil
of an ordinary automotive relay and this will generate the neccessary
flyback that the tacho requires to work. We have done this on our Orbital
engine powered Ford Festiva's.
I'll send you a diagram if you like. 

Pete.


> -----Original Message-----
> From:	Mike Kearny [SMTP:mike.kearny@xxxxxxxxx]
> Sent:	Thursday, 1 June 2000 7:45
> To:	'eec@xxxxxxxxxx'
> Cc:	Justin Regnier (E-mail 2)
> Subject:	RE: [eec] Tach driver for '99+ COP EECs??
> 
> A friend of a friend of mine built a device that generated a tach signal
> based on the 
> another signal floating around in the car somewhere, I'll try to get a
> hold
> of him. 
> He also said that Autometer might have something that would work.
> 
> Justin, forward this to your friend with the Saleen.
> 
> Later,
> 
> Mike
> 
> 
> 		-----Original Message-----
> 		From:	Richard Barkley [mailto:Richard.Barkley@xxxxxxx]
> 		Sent:	Wednesday, May 31, 2000 12:05 PM
> 		To:	List, EEC
> 		Subject:	[eec] Tach driver for '99+ COP EECs??
> 
> 		Anyone know of a tach driver for the new EECs? 
> 
> 		There is no output listed in the wiring diagram, but somehow
> the instrument
> 		cluster is getting the info, perhaps digitally over the DLC
> as that is the
> 		only connection as far as I can see. On the '96 and '98 (at
> least) pin 48
> 		on the EEC was for the Ignition Diagnosis Monitor which I
> think was used to
> 		drive the tach. I call Dallas Mustang and Summit Racing, and
> neither has a
> 		solution. Dallas Mustang said they were working on one, but
> we all know how
> 		fast they are. One thought is that pin 48 is still active,
> just not used.
> 		But if it were that simple, I'd think DMP would know about
> it.
> 
> 		Any ideas or suggestions are welcome.
> 
> 		Richard Barkley
> 
> 
> 	
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